This video shows the construction process of the Incremental Launching Method in bridge engineering.
This method involves casting the bridge superstructure in segments of a specific length at a casting yard located behind the abutment.
Once the concrete is cured, hydraulic jacks are used to push the structure forward along the bridge axis to complete the bridge.
[Application Environments and Specifications of ILM]
The ILM is an excellent choice primarily when crossing rivers or deep valleys.
When it is necessary to cross over existing road networks or railways, construction can proceed without disrupting the traffic flow below.
In areas where environmental protection is strictly required, the use of temporary bents can be minimized to reduce environmental damage.
It is generally most economical for bridges with span lengths between 30m and 60m, and can be applied to spans of over 100m if temporary piers are used.
The cross section of the superstructure is predominantly a box girder shape with high torsional rigidity to handle the stress changes that occur during construction.
This method has alignment constraints, meaning it can only be applied to straight bridges or curved bridges with a constant radius of curvature.
[Technical Comment]
Looking at the attached animation, the reaction wall supporting the hydraulic jacks when pushing the structure seems to be depicted as somewhat small.
In an actual construction site, a much larger and more robust reaction wall structure is essentially required to overcome the load and friction of a superstructure weighing thousands of tons.
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